//
//  AppDelegate.swift
//  show
//
//  Created by 李威 on 2022/2/23.
//

import UIKit

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }

    // MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }

}

protocol AwakeProtocol {
    static func awake()
}

/*
 问题：swift中废弃load方法，没有合适的时机执行method swizzle
 方案：所有遵守AwakeProtocol协议的类，运行时获取所有的类 逐个执行awake方法*/
/// method swizzle 代替load方案
class Awake {
    fileprivate class func performOnce() {
        //获取已注册类的个数
        let count = Int(objc_getClassList(nil, 0));
        //申请分配内存空间
        let classes = UnsafeMutablePointer<Any>.allocate(capacity: count);
        let autoreleaseClasses = AutoreleasingUnsafeMutablePointer<AnyClass>(classes);
        
        //获取所有已注册的类
        objc_getClassList(autoreleaseClasses, Int32(count));
        for index in 0..<count {
            (classes[index] as? AwakeProtocol.Type)?.awake();
        }
        classes.deallocate();
    }
}

